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How to solve Nibiru Probe from Innopolis Open?
By mraron, history, 10 years ago, In English

Hello,

It's from Innopolis Open, Final Round, 2015-2016, the problem A. I can't approach it, can somebody give me a hint?

Have nice day,

mraron

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10 years ago, hide # |
 
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When the left end of the segment (segment of length L) moves between coordinate x0 and x0 + 1 (x0 is integer), the covered area changes as a linear function. The sum/difference of slopes is enough to say how it changes.

You should sweep over the given points, updating something when the sweep is over some point or some point is L to the right from the sweep line. This way you will know the area for any placement you want.

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